A person sitting down and pointing.
Correct. An alien space ship model.
No, not that one. This is a diamond between two large wings.
No, not that one. This is some kind of flying machine on a triangle base.
Correct! A tall high-heeled boot.
No, try again.
No, this shape is tall and vertical.
Close, but no. This shape has a bottom that is flat on the left and pointed on the right.
No. This shape is a tall vertical shape with a bottom that is flat on the left and pointed on the right.
None of those three shapes you just added are right, remove all of them.

Outcome: unsuccessful
Speaker comments: Bot added three wrong answers on the last round, couldn't remove them in time.